Doepfer A-140 ADSR (Envelope Generator) - Manual

doepfer System A - 100 ADSR A-140
1
1. Introduction
Module A-140 (ADSR) is an envelope generator,
and, since it puts out control voltages, counts as one
of the modulation devices in a modular system.
As soon as the gate input receives sufficient voltage,
the ADSR generates a variable voltage, changing in
time, called an envelope. This varying voltage is
output in normal (positive) and inverted form, and can
be used, eg., for voltage controlled modulation of a
VCO, VCF, or VCA, or for processing other modules’
inputs and outputs.
The shape of the envelope is governed by four para-
meters: Attack, Decay, Sustain and Release (see Fig.
1 on page 3).
The envelope is started (triggered) by a gate signal
either from the INT.GATE voltage on the system bus,
or, if a signal is put into it, from the gate input socket.
The envelope can also be re-triggered, ie. start from
scratch again, each time a trigger signal is sensed at
the Retrig. input socket, when the gate is still open
(see Fig. 2 on page 5).
Gate
Decay
Inverse
Output
Release
Attack
A-140
ADSR
Sustain
Retrigger
Output
Output
ADSR
Control
Time
Range